B1257
Air Temperature External Sensor Circuit Short To Ground
B1257 is an OBD-II diagnostic trouble code meaning: Air Temperature External Sensor Circuit Short To Ground. Common causes: damage to the sensor wiring harness, short circuit to ground. Estimated repair cost: $17–56.
Symptoms
- Incorrect outdoor temperature readings
- Problems with climate control
- Malfunction indicator light comes on
Causes
- Damage to the sensor wiring harness
- Short circuit to ground
- Outside air temperature sensor malfunction
- Problems in the control unit
How to Fix
- Check the integrity of the sensor wiring harness
- Measure the resistance of the temperature sensor
- Check circuit grounding
- Replace sensor if necessary
- Check the operation of the control unit
Related codes
FAQ
What does the B1257 code mean?
B1257 is an OBD-II diagnostic trouble code that indicates: Air Temperature External Sensor Circuit Short To Ground
What causes a B1257 error code?
The most common causes of B1257 include: Damage to the sensor wiring harness; Short circuit to ground; Outside air temperature sensor malfunction; Problems in the control unit.
How do I fix a B1257 diagnostic trouble code?
To fix B1257: Check the integrity of the sensor wiring harness. Measure the resistance of the temperature sensor. Check circuit grounding. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B1257?
Limited driving only, diagnose soon
How much does it cost to fix B1257?
The estimated repair cost for B1257 is $17–56. Actual cost depends on your vehicle, location, and labor rates.
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